Update apachepulsar/pulsar Docker tag to v2.10.3

This MR contains the following updates:

Package	Type	Update	Change
apachepulsar/pulsar	ironbank-docker	patch	2.10.2 -> 2.10.3
apachepulsar/pulsar		patch	2.10.2 -> 2.10.3
apachepulsar/pulsar	stage	patch	2.10.2 -> 2.10.3

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